I hope that this is not redundant since I have not read all of the posts in this thread. The conventions that have evolved for defining SNR, MDS etc have all...
72303
Milt Cram
w8nue
Feb 18, 2013 9:30 pm
... Hi all, In all of the discussion thus far, I have heard no mention of "power spectral density". In SDR applications, where an FFT is usually used to ...
72304
warrenallgyer
Feb 18, 2013 9:43 pm
Thank you Milt and Tony! A wonderful explanation of the phenomenon I have been observing. My follow-on question would be: Could we incorporate the spectral...
72305
Jerry Haigwood
w5jhjerry
Feb 18, 2013 10:11 pm
Hi All, I am trying to install the USB driver for my XP machine. I downloaded the driver from here: http://pe0fko.nl/SR-V9-Si570/index.shtml#install And...
72306
John Williams
jswillms
Feb 18, 2013 10:24 pm
Backup one directory to where the pe0fko.inf file is located. John - ke5ssh ... -- John Williams KE5SSH - ham since 2007 WQKA523 - GMRS for family use on the...
72307
warrenallgyer
Feb 18, 2013 10:28 pm
Chris I am guessing you are suffering overload from a very strong local signal that is in the filter bandpass of the receiver. I see a very similar display on...
72308
warrenallgyer
Feb 18, 2013 10:39 pm
Chris One additional thought that came shortly after hitting "SEND".... If it is overload, and if you have a scope, you can probe the crossover jumpers on the...
72309
Jerry Haigwood
w5jhjerry
Feb 18, 2013 10:40 pm
Yep, just figured that out a few minutes ago. The Si570 is working fine! Thanks. Jerry W5JH "building something without experimenting is just solder practice"...
72310
Chris Wilson
chrismwilsonuk
Feb 18, 2013 10:42 pm
... 18/02/2013 22:36 I need to do some more testing. I got a similar signal on 10 meters this afternoon. Disconnecting the antenna at the Softrock antenna ...
72311
Milt Cram
w8nue
Feb 18, 2013 10:55 pm
... Hi Guys, Re: Minimum Detectable Signal and Minimum Discernable Signal If you haven't already read this--take a look. ...
72312
Jakub Sarna
jakubsarna
Feb 19, 2013 12:47 am
Hello Gentlemen I have a question if someone could help me in this topic Well, I have my desktop radio FT-1000D as well as Softrock I use, and I would like at...
72313
Jerry Dunmire
jedunmire
Feb 19, 2013 12:52 am
Hi Jakub, I have a similar setup and here is what is working for me: http://rockingdlabs.dunmire.org/projects/antenna-isolator 73, ...jerry KA6HLD...
72314
edingraham
Feb 19, 2013 12:58 am
When operating at Full Speed, USB sends a Start Of Frame each millisecond. With light buss traffic (and poor USB shielding) this might be visible. Try a new...
72315
Jakub Sarna
jakubsarna
Feb 19, 2013 1:20 am
Hi Jerry thanks for the info, this with you using a TS-440 and PTT took control of the REMOTE jack, I have a FT-1000D and in me there is no such slot ...I'm...
72316
Alex
malard...
Feb 19, 2013 2:35 am
I also figured out that using a poor audio cable [from rxtx to soundcard] for the input from the rxtx to soundcard will cause a problem. I replaced both tx and...
72317
Alan
alanzfq
Feb 19, 2013 8:25 am
... Subject: [softrock40] Re: Softrock Dynamic Range and MDS Redux Nick, Is this using 16 or 24 bits? Your figure relates closely to what has been said to be a...
72318
warrenallgyer
Feb 19, 2013 8:41 am
You guys have cleared up a couple of mysteries for me. The "RBW" control on HDSDR controls the resolution bandwidth which, I believe, equates to the FFT bin...
72319
g3vnc
Feb 19, 2013 4:47 pm
... Well said Milt!...
72320
g3vnc
Feb 19, 2013 4:55 pm
... It's a standard Delta 44 so I would say 16 bits. Agree the MDS is probably sound card limited. ... Maybe, if you have been measuring over 100dB SFDR. Have...
72321
ansjones
Feb 19, 2013 5:18 pm
This item has been sold....
72322
Jerry Dunmire
jedunmire
Feb 19, 2013 5:24 pm
Hi Jakub, You are correct, the circuit as show will not work if the TX signal goes low on transmit. I'm not familiar with the FT-1000D, but maybe the TX-GND ...
72323
KF4BQ
mikecol2
Feb 19, 2013 5:36 pm
... Hi Nick, I found my tests on the RX Ensemble that I did a couple of years ago and put it in the files section under my call KF4BQ. I usually follow ARRL...
72324
warrenallgyer
Feb 19, 2013 6:26 pm
Mike Are you sure on the +20 dBm intercept. At about +17-18 dBm the mixer saturates and starts putting out 5 V P-P square waves. +20 dBm at this same point...
72325
FRANCIS CARCIA
wa1gfz
Feb 19, 2013 6:40 pm
I measured just over 100db dynamic range with rock 4 interfaced to HPSDR Janus. I think I reduced the gain of the op amps. (MDS = NF + 3dB delivered audio...
72326
KF4BQ
mikecol2
Feb 19, 2013 9:43 pm
... Hi Warren, Yes, I am sure on the +20dBm IP3. This is a calculated value based on the 2 tone input levels and the resulting IMD products. You normally...
72327
Angus
angu57oung
Feb 20, 2013 1:58 am
I have a similar problem to this guy, however I am not reading any current anywhere. My voltages look good: 11.6V at D1 and 5V at R11. I am running a power...
72328
max4object
Feb 20, 2013 4:26 am
إذا كنت تخاف من الارتفعات، ننصحك بأن لا تدخل ! <http://mt2tm.com/wp/if-you-are-afraid-of-heights-do-not-look/> If you are...
72329
Alan
alanzfq
Feb 20, 2013 6:16 am
... Subject: [softrock40] Re: Softrock Lite II - Power Supply Test Fail ... If you have 5V it must be taking current. Only a few mA, but a test meter should be...
72330
g3vnc
Feb 20, 2013 3:48 pm
... Thank you Mike. Do you think that using the EMU1212M you were seeing the noise floor of the Ensemble Rx? I guess if its a 24 bit card then you should do. ...
72331
Nick Norman
nick_norman2002
Feb 20, 2013 3:54 pm
... OK all, A follow up: The original Si570 was broken The replacement is 100%, Finally got round to finished the assembly and it works in RX mode - not tried...
